3120929 Lync/Skype for Business client can't connect with Exchange in Office 365 dedicated/ITAR

For Outlook Web App (OWA) issues, see the following KB article:

2617097 You cannot start or receive a Lync chat through OWA in Office 365 dedicated or ITAR

Escalation instructions

If the information under the "Process to follow for common scenarios" section does not contain a solution for the issue in question, contact Microsoft Online Services Support by online submission or by telephone . The following information is required for all Lync cases:

Make sure that you provide the following files:

The .uccapi and .etl log files. These files are taken when the issue is reproduced.

Note The context of the issue that is reproduced in the logs is important. Please specify the target user, the time frame, and the steps that were taken while the issue was reproduced and logging was enabled. A Problem Steps Recorder (PSR) report that describes in detail the process and experience of the issue while logging was being performed is also very helpful.

If you don't provide the files that are mentioned in step 1, the service request will be rejected in most cases. However, there are some exceptions. They are as follows:

Contacts and discretionary access control list (DACL) or system access control list (SACL) restore requests